Covid-19, also against Omicron, if it has been administered three times". But they warned that "the Omicron variant is probably not sufficiently neutralised after two doses." According to early laboratory research using blood serum from vaccinated people, a booster third dose generated around the same level of antibodies against Omicron as is seen after a second dose with the initial strain.
Blood samples from around 20 people who had received two doses of the current vaccine showed on average a 25-fold reduction in neutralising antibodies compared to the early strain of the virus, the companies said.
But they added that another part of the immune response -- from T cells -- were probably still effective against the variant, adding that